Gluon contributions to the pion mass and light cone momentum fraction
Harvey B. Meyer, John W. Negele
TL;DR
This study uses quenched lattice QCD to quantify gluon contributions to the pion's mass and momentum, revealing that gluons carry about 37% of the pion's light cone momentum.
Contribution
It provides the first lattice QCD calculation of gluonic contributions to the pion's mass and momentum, including the trace anomaly effects.
Findings
Gluons contribute approximately 37% of the pion's light cone momentum.
The study offers matrix elements related to the trace anomaly for the pion.
Discretizations used have applications in hadron spin and QCD thermodynamics.
Abstract
We calculate the matrix elements of the gluonic contributions to the energy-momentum tensor for a pion of mass 600 < Mpi < 1100 MeV in quenched lattice QCD. We find that gluons contribute (37 +/- 8 +/- 12)% of the pion's light cone momentum. The bare matrix elements corresponding to the trace anomaly contribution to the pion mass are also obtained. The discretizations of the energy-momentum tensor we use have other promising applications, ranging from calculating the origin of hadron spin to QCD thermodynamics.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research · Particle physics theoretical and experimental studies